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Re: Installing Windows with Debian already installed



Wow.  Your message came as a separate base64 encoded attachment.
Whatever you did when you sent it please try to do something different
next time.

Gustavo J Mata wrote:
> I recently installed Debian on a new hard disk. Although I rarely used
> Windows I kept a 20 Gb partition to install it, just in case.

Usually installing Windows is better if that part is done first.
Windows doesn't play as well with other systems.  Better if Windows is
installed when there isn't any other system for it to know about.
Then later install Debian and let Debian work around Windows.

It isn't required to be done in this order but everything flows better
if it is done in that order.

> I've found out that if I do install Windows, I won't be able to boot
> Debian.

Windows will replace the MBR (main boot record) with its own MBR and
at that point it will only be able to boot Windows.

> Although it appears that this can be fixed,

Yes.  Very easily.  Simply replace the Windows MBR with one that can
boot both such as with Grub.

> I want to make sure I know what I'm doing before risking having to
> start all over again.
> 
> Any hints?

AS a hint, normally I always recommend two difference disks.  One for
Windows and one for Debian.  Then there isn't any conflict between
them.  But of course that isn't necessary.  Just convenient.  :-)

I assume that you installed using a Debian install cdrom or usb boot
image?  If so then keep that available because it also makes a very
useful rescue system.  After installing Windows and having Windows
wipe out your existing grub MBR it is easy to boot the Debian
installer and use rescue mode to get to a root shell on your Debian
system.  Then reinstall grub onto the system.

Which release of Debian did you install?  (cat /etc/debian_version)
What architecture?  (uname -m)  What bootloader?  (dpkg -l 'grub*')

The recent changes from grub (now called grub-legacy) to grub 2
(called grub-pc) means there will be differences in grub install
commands.  (Assuming that you are using grub not lilo or other of
course.)  The 'grub-install' script should hide most of those
differences.

  man grub-install

With the older grub I never used the script and always ran the grub
commands interactively.  With the new grub everything is different
now, the interactive mode isn't available anymore, and I haven't
experience with the new script so will avoid suggesting a usage.

Bob

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